本文選題：粉體揚塵 + 氣固兩相流��； 參考：《江南大學(xué)》2017年碩士論文

【摘要】：近年來,隨著粉體物料需求日益增加,由粉體生產(chǎn)、包裝引起的粉塵污染日趨嚴重。特別在粉體充填包裝中產(chǎn)生的大量粉塵,不僅磨損生產(chǎn)設(shè)備,影響包裝精度,更傷害工人健康。本課題通過分析揚塵規(guī)律,優(yōu)化設(shè)計粉體除塵系統(tǒng)。具體在理論分析和模擬仿真基礎(chǔ)上分析粉體充填揚塵的影響因素以及控塵措施;計算粉塵顆粒收集條件;設(shè)計除塵罩及確定除塵參數(shù)。通過整合兩種除塵方式,設(shè)計粉體充填包裝工藝路線、工作循環(huán)圖。本課題旨在分析粉體下落揚塵的一般規(guī)律及影響因素,為粉料包裝除塵提供理論參考。論文研究的主要內(nèi)容如下:(1)對本課題研究對象進行調(diào)研分析,確定主要研究內(nèi)容。通過分析粉體包裝過程中的實際揚塵情況與危害,并調(diào)研該行業(yè)的生產(chǎn)現(xiàn)狀以及發(fā)展趨勢,確定課題研究的目的和意義。在查閱文獻和生產(chǎn)調(diào)研基礎(chǔ)上,掌握國內(nèi)外對粉體包裝,揚塵處理方面的現(xiàn)狀與進展;理清理論研究方法—氣固兩相的發(fā)展趨勢;分析現(xiàn)有包裝方法中除塵的理念和措施。在此基礎(chǔ)上,明確了課題主要研究內(nèi)容與課題開展方向。(2)對粉體充填揚塵理論的分析。從顆粒、粉體的基本物理特性展開分析,明確顆粒粒徑、粒徑分布以及粉體密度、流動性特點,分析顆粒密度與粉體密度的聯(lián)系與區(qū)別,了解顆粒揚塵的基本產(chǎn)生條件。在此基礎(chǔ)上根據(jù)粉體下落揚塵現(xiàn)象,分析顆粒與氣流的作用過程,將其明確歸納為氣固耦合作用。在此基礎(chǔ)上,分析總結(jié)粉體揚塵的因素條件,特別針對粉體包裝過程的揚塵提出顆粒密度、質(zhì)量流量以及下落高度三個關(guān)鍵因素。最后,基于粉體揚塵理論,提出適于粉體充填包裝的除塵系統(tǒng)構(gòu)思。(3)除塵流場內(nèi)顆粒的平衡條件及理論計算。根據(jù)氣固兩相中顆粒在流場內(nèi)的受力理論,結(jié)合顆粒實際運動情況分析氣流對顆粒的受力,場強對顆粒的受力以及其它一些作用力。分析氣流與氣壓對顆粒作用的關(guān)系,發(fā)現(xiàn)氣壓現(xiàn)象本質(zhì)由氣流產(chǎn)生。通過預(yù)估顆粒受力的量級大小,分析紊流雷諾數(shù)對顆粒運動影響,給出抽氣集塵時顆粒的受力上限、下限平衡方程。將方程整理、簡化為氣流速度和顆粒粒徑為自變量對顆粒受力大小因變量的關(guān)系式。最后,通過MATLAB繪制平衡方程,分析抽氣除塵的理論風(fēng)速條件。(4)對粉體充填揚塵進行仿真模擬,分析影響因素。在氣固兩相理論基礎(chǔ)上,分析仿真機理選取合適的仿真模型與計算條件。根據(jù)生產(chǎn)實際與國家標準建立粉袋模型,設(shè)置模型參數(shù)和仿真條件,并對模型網(wǎng)格進行無關(guān)性驗證。在此基礎(chǔ)上,分析顆粒密度、質(zhì)量流量及下落高度對粉體下落充填揚塵的影響。以顆粒速度分布、顆粒駐留時間、氣流速度分布以及顆粒分布占比等為基礎(chǔ)分析了粉袋內(nèi)顆粒與氣流的實際作用情況。最終確定粉體下落產(chǎn)塵量最少的距離區(qū)間。(5)除塵系統(tǒng)優(yōu)化設(shè)計。根據(jù)粉體除塵罩設(shè)置理論和粉體實際充填情況設(shè)計除塵罩。并建立除塵罩模型,設(shè)置仿真參數(shù)條件并模擬粉體除塵過程。通過顆粒速度分布、氣流速度分布及顆粒分布占比探究合理風(fēng)速。計算除塵功率,將得到的除塵參數(shù)整合,設(shè)計粉體除塵系統(tǒng),并根據(jù)工藝路線繪制工作循環(huán)圖。
[Abstract]:In recent years, with the increasing demand of powder material, the dust pollution caused by the powder production and packaging is becoming more and more serious. In particular, a large amount of dust produced in the packing and packing of powder is not only worn out to wear production equipment, but also affects the packaging precision and harm the workers' health. This subject is to optimize the dust removal system by analyzing the dust law. On the basis of analysis and Simulation simulation, the influence factors of dust filling and dust control and dust control measures are analyzed, the collecting conditions of dust particles are calculated, dust cover and dust removal parameters are designed. Through the integration of two kinds of dust removal methods, the process route of powder filling packaging and working cycle diagram are designed. The purpose of this topic is to analyze the general rule of dust falling. The main contents of the paper are as follows: (1) research and analysis of the subject of this subject, determine the main research content. Through the analysis of the actual dust situation and harm in the process of powder packaging, and investigate the production status and development trend of the industry, to determine the research topic. Objective and significance. On the basis of consulting literature and production research, we can grasp the status and progress of powder packaging and dust treatment at home and abroad, clarify the development trend of the theoretical research method - gas solid two phase, analyze the concept and measures of the dust removal in the existing packaging methods. On this basis, the main research content and the project development are clarified. (2) analysis of the theory of dust filling and dust. From the basic physical characteristics of particles and powders, the particle size, particle size distribution, powder density, fluidity characteristics, the analysis of the relation and difference between particle density and powder density are analyzed, and the basic conditions of particle dust are understood. Based on this, the dust phenomenon of the powder is lowered. The action process of particle and air flow is analyzed, and it is clearly summed up as gas-solid coupling effect. On this basis, the factors of powder dust are analyzed and summarized. In particular, three key factors, particle density, mass flow and falling height, are put forward. Finally, based on the theory of powder dust, powder filling bag is put forward. The design of the dedusting system. (3) the equilibrium conditions and theoretical calculation of the particles in the dust flow field. According to the theory of the force in the flow field in the two phase of the gas solid, the force of the air on the particles, the force of the field strength to the particles and some other forces are analyzed according to the actual movement of the particles. The relationship between the effect of air and pressure on the particles is analyzed. The present pressure is essentially generated by the air flow. By estimating the magnitude of the force of the particles, the influence of the turbulent Reynolds number on the particle motion is analyzed. The upper limit of the force and the lower equilibrium equation are given. The equation is arranged to simplify the relationship between the velocity of air flow and the particle size as the dependent variable on the size of the particles. Finally, through the equation, the relationship between the particle size and the particle size is simplified. The MATLAB balance equation is plotted and the theoretical wind speed conditions are analyzed. (4) the influence factors are simulated and the influence factors are analyzed. On the basis of the gas solid two phase theory, the suitable simulation model and the calculation conditions are selected for the simulation mechanism. The model parameters and imitation of the model are set up according to the production practice and the national standard. On the basis of this, the effect of particle density, mass flow and falling height on dust filling and dust is analyzed on this basis. The actual effects of particle velocity distribution, particle residence time, airflow velocity distribution and particle distribution ratio are analyzed on the basis of particle density, particle density, flow velocity distribution and particle distribution ratio. The optimum design of dust removal system is finally determined. (5) the design of dust removal system is optimized. Dust cover is designed based on the theory of dust dust cover setting and actual filling of powder. A model of dust cover is set up. The simulation parameters are set up and the process of dust removal is simulated. The distribution of particle velocity, distribution of air velocity and distribution of particles are carried out by the particle velocity distribution. Compared with exploring reasonable wind speed, calculating the power of dust removal, integrating the dedusting parameters, designing the dust removal system, drawing the working cycle diagram according to the technological route.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X701.2

【參考文獻】

相關(guān)期刊論文 前10條

1 馮彬彬;唐正寧;;粉體在袋裝充填過程中的揚塵規(guī)律[J];包裝工程;2017年07期

2 趙萌;毛軍;郗艷紅;;高雷諾數(shù)下有限長圓柱繞流阻力特性研究[J];機械工程學(xué)報;2015年22期

3 王怡;樊航;任曉芬;;自由下落非均一粒徑顆粒流的流場特性[J];西安建筑科技大學(xué)學(xué)報(自然科學(xué)版);2015年03期

4 李娟;張琰;白俊武;席娜;;基于FLUENT對自動配料除塵裝置的優(yōu)化設(shè)計[J];機械工程師;2015年03期

5 馬凡程;徐繪芹;趙真珍;張靜;;除塵罩更換施工技術(shù)實踐[J];萊鋼科技;2014年02期

6 楊福林;高菲;;淺談霧霾天氣的環(huán)境毒理效應(yīng)[J];安徽農(nóng)學(xué)通報;2013年16期

7 王建偉;;除塵器吸塵罩改進[J];設(shè)備管理與維修;2012年09期

8 ;New formula for drag coefficient of cylindrical particles[J];Particuology;2011年02期

9 趙永嶺;劉澤勤;趙敬華;王亞南;孫爾雁;姜勝磊;;微粒羽流自由降落過程特性的探討[J];鄭州大學(xué)學(xué)報(工學(xué)版);2007年03期

10 孟超;席衛(wèi)平;聞威;王U，

本文編號：2097357